{"product_id":"circle-seal-controls-559b-8m-5-control-valve","title":"Circle Seal Controls 559B-8M-.5 Control Valve","description":"\u003cdiv\u003e\u003cp\u003eCircle Seal Controls Model 559B-8M-.5 is a 1\" brass pop-off relief valve (500-Series) designed for compact, automatic overpressure protection in small-diameter systems. It features a male pipe-thread inlet, Buna N seals, and an adjustable cracking pressure from 0.5 to 150 psig (the.5 variant specifies a minimum setting of 0.5 psi) with a cracking‑pressure tolerance of ±5%, and it operates from -65 to 275 °F. The valve is rated for 400 psig proof pressure and 500 psig burst pressure, with overall dimensions of about 3.16\" long and 1.89\" in diameter and a weight near 1 lb. Typical applications include storage tanks, refrigeration and HVAC equipment, process control instrumentation, and vacuum pump safety, with optional body materials such as brass, 303\/316 stainless steel, or aluminum and features like tamper‑proof adjustment and factory preset options to ensure precise, repeatable set pressures.\u003c\/p\u003e\u003c\/div\u003e","brand":"CIRCLE","offers":[{"title":"New","offer_id":51678088495406,"sku":null,"price":54.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0940\/0818\/1038\/files\/Ebay_website_image_4eab0196-479f-412f-8397-33fc9177f37d.jpg?v=1769571574","url":"https:\/\/plgautomation.com\/products\/circle-seal-controls-559b-8m-5-control-valve","provider":"PLG Automation ","version":"1.0","type":"link"}